The anti spam filters in Microsoft Outlook and Windows Live Mail are not bad, but they are no way as good as the anti spam filter in Gmail. It is just fantastic. I hardly use my Hotmail account so the majority of my mail is spam:
Last autumn I migrated all my mail to Google Apps. It took me a while to upload my 4.5GB of mail but it was worth it. Instant search and "zero" spam. Since New Year I have only received 1 spam mail in my inbox!
The best feature though has to be the threading. It makes it a lot faster to catch up with e-mail and see the context of long e-mail threads.
Some Gmail productivity tips:
You can use Gmail as your mail reader even if you have another email server like Exchange by adding another account.
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